Real world article
(written from a production point of view)
The Hovarian Cluster was a location mentioned in the script of Star Trek: Deep Space Nine seventh season episode "Prodigal Daughter", but cut out of the final version of the episode.
According to the script, Yanas Tigan had a solarium in the Tigan home with tiles brought in from Andoria that were hand-painted by a "charming old man" she had met on a trip to the cluster. The episode as aired included this dialog, but cut of due to Yanas leaving the room and the door closing after her just before she could mention the cluster.